Blinken was meeting on Sunday with senior Moldovan officials who are appealing for international assistance in dealing with more than 120,000 refugees from Ukraine that it is now hosting while also seeking security reassurances against potential Russian aggression. More than 230,000 people have fled into Moldova from Ukraine since the war began 11 days ago.

Blinken said Moldova's welcoming of refugees is an inspiration to the world.

"We admire the generosity of hospitality, the willingness to be such good friends to people who are in distress, and, indeed, I want to do everything we can to help you deal with the burden that this has imposed,'' he said.

Russia already has troops in the country of 2.6 million that are stationed in the disputed territory of Transnistria and are being closely watched as Russian President Vladimir Putin presses ahead with the invasion of Ukraine. Although it has no plans to try to become a member of NATO, Moldova formally applied to join the European Union just three days ago in a fast-track bid to bolster its ties with the West.